Analysis of accumulation factor of 137Cs in bottom sediments of lakes and rivers with concentration of the radionuclide close to background levelsA.V. Nossov, A.L. Krylov et V.P. KisselevRadioprotection, 46 6 (2011) S461-S465DOI: https://doi.org/10.1051/radiopro/20116594s